Whether in their policy of religious tolerance, devising a universal alphabet, maintaining relay stations, playing games, or printing almanacs, money, or astronomy charts, the rulers of the Mongol Empire displayed a persistent universalism. Because they had no system of their own to impose upon their subjects, they were willing to adopt and combine systems from everywhere. Without deep cultural preferences in these areas, the Mongols implemented pragmatic rather than ideological solutions. They searched for what worked best; and when they found it, they spread it to other countries. They did not have to worry whether their astronomy agreed with the precepts of the Bible, that their standards of writing followed the classical principles taught by the mandarins of China, or that Muslim imams disapproved of their printing and painting. The Mongols had the power, at least temporarily, to impose new international systems of technology, agriculture, and knowledge that superseded the predilections or prejudices of any single civilization; and in so doing, they broke the monopoly on thought exercised by local elites.